The best advice is to download the latest data sheet for your PIC, grab a highlighter, check what features are available.
Then check the appropriate section, and change the registers as needed.
For example, your 18F4550 has a potential 13 ADC Ports.
If you look on pg 262, of the current data sheet, ADCON1 = $F '(%00001111) setting will turn all your ADC ports into Digital.

Unfortunately I don't know of any list that will clearly show all available.

If you are having difficulties, post your code, and someone can point you in the right direciton.
Quote Originally Posted by Tina10 View Post
I do not know if this has been discussed before but I could not find much information about it. I worked on 16F877A for sometime and know about setting fuses, initial registers, setting digital/analog i/o etc etc. I am having big problems understanding the setting up of 18F4550. Are there any guidance/notes anywhere which can make it a bit easier to understand for not so technically inclined. Datasheet seems to be a bit complicated at this stage. Thanks in advance.